I have been using the Darwin by Evolv for a while now and I love it. It is my first VV device. Before this I used the eGo-T. What I loved about the eGo-T was that I could just fill a tank in the morning and it lasts me all day or even next day. So I ordered some 510-T. First two just started to taste like ..... (not sure if it is burnt taste but like wet nasty towel) after 10 puffs or so. First one I started with low wattage and gradually moved it up. Second one I kept it at low wattage and same results. I am now looking for some kind of tank mod that would work great with the Darwin. Does the MAP tank work? I don't mind if I have to unscrew to power off. That is better than filling a carto every few puffs. I'm not sure if it has a 510 to 510 adapter on my device but on the brass switch there is a silver 510 connection. When switched on, it sticks up above the device so I think I can attach a MAP Tank if the MAP Tank has 510 connection. Any recommendations would be greatly appreciated and it doesn't have to be MAP Tank. THANKS!